Sheet-on-sheet TiO2/Bi2MoO6 heterostructure for enhanced photocatalytic amoxicillin degradation

Yuting Wang; Gancheng Zuo; Jijie Kong; Yang Guo; Zeyu Xian; Yuxuan Dai; Junjie Wang; Tingting Gong; Cheng Sun; Qiming Xian

doi:10.1016/j.jhazmat.2021.126634

Sheet-on-sheet TiO₂/Bi₂MoO₆ heterostructure for enhanced photocatalytic amoxicillin degradation

J Hazard Mater. 2022 Jan 5:421:126634. doi: 10.1016/j.jhazmat.2021.126634. Epub 2021 Jul 14.

Authors

Yuting Wang¹, Gancheng Zuo², Jijie Kong¹, Yang Guo³, Zeyu Xian¹, Yuxuan Dai¹, Junjie Wang¹, Tingting Gong¹, Cheng Sun¹, Qiming Xian⁴

Affiliations

¹ State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment Nanjing University, Nanjing 210023, PR China.
² School of Environment, Nanjing Normal University, Nanjing 210023, PR China. Electronic address: njuzgc@163.com.
³ State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment Nanjing University, Nanjing 210023, PR China; Nanjing Institute of Environmental Science, Ministry of Environmental Protection of China, Nanjing 210042, PR China.
⁴ State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment Nanjing University, Nanjing 210023, PR China. Electronic address: xianqm@nju.edu.cn.

PMID: 34330077
DOI: 10.1016/j.jhazmat.2021.126634

Abstract

Developing sheet-on-sheet (2D/2D) heterostructure with built-in electric field (BIEF) is effective in boosting the performance of photocatalysts for emerging contaminants degradation. Herein, the 2D/2D microtopography and (-)TiO₂/(+)Bi₂MoO₆ BIEF were precisely integrated into hierarchical nanosheets, which can provide the basis and driving force for charge transfer both in in-plane and interface of heterojunction. The prepared photocatalyst (TiO₂/Bi₂MoO₆) showed high-efficiency and stable performance for photocatalytic amoxicillin (AMX) degradation, which was 18.2 and 5.7 times higher than TiO₂ and Bi₂MoO₆, respectively. More importantly, TiO₂/Bi₂MoO₆ showed more efficient photocatalytic activity and photogenerated charge separation than TiO₂@Bi₂MoO₆ (different morphology). Besides, four possible pathways of AMX degradation were proposed depending on Gaussian calculations and intermediates analysis by GC-MS and HPLC-TOFMS. This work sheds light on the design and construction of unique 2D/2D heterostructure photocatalysts for AMX degradation.

Keywords: Amoxicillin; Built-in electric field; Photocatalytic degradation; Sheet-on-sheet heterojunction; Ultrathin TiO(2) nanosheets.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Amoxicillin*
Bismuth*
Catalysis
Molybdenum
Titanium

Substances

Bi(2)MoO(6)
titanium dioxide
Amoxicillin
Molybdenum
Titanium
Bismuth